this is "nightline." >> tonight, donald trump not just doubling down. >> well, i was very viciously attacked -- >> but tripling down on his comments about the gold star parents of captain khan. >> i think when you're, you know -- when you're spoken to that way, you're allowed to say something bad. >> leavi s time has he gone too far? plus, looking for love. >> all i want is for you to be happy. >> he didn't get chosen for "the bachelorette." how about dating snapchat style? can the latest online sensation crack the $2 billion industry? >> cheers to that. >> first the "nightline 5." >> mobility is very important to i don't. i use etrade mobile. it suit miz mobile lifestyle. the it keeps my investments

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cable can't offer internet speeds this fast at a price this good. only fios can. good even. thank you for joining us. it was a heartfelt indictment delivered by a father still grieving the loss of his soldier son. four days later, republican nominee donald trump still can't seem to let it go. his contentious comments continue to spark backlash and outrage. here's abc's david wright. >> reporter: this week, donald

country back together. >> reporter: but probably not in the way he intended. >> the state of our union is in a war of words. >> donald trump firing back at a growing chorus of creditables -- >> how dare you? >> reporter: even in the face of growing outrage trump tonight was detint. >> i was very viciously attacked. >> please welcome khizr khan. >> reporter: it started with this speech. >> tonight we are honored khan and as patriotic american muslims. >> reporter: the muslim parents of a fallen soldier speaking at the democratic national convention. captain khan was 27 years old. >> you want to see the best of america, you need look no further than army captain hummayun khan. >> reporter: at the convention his father spoke from the heart. his grieving wife standing

>> if it was up to donald trump, he never would have been in america. >> reporter: then the clincher. khan brought up trump's plan to temporarily ban muslim immigrants, like them, from entering the u.s. >> have you even read the united states constitution? i will gladly lend you my copy. you have sacrificed nothing. and no one. >> who wrote that? did hillary's script writers write it? >> reporter: abc's george stephanopoulos asked trump about the khans. >> how would you answer that? what sacrifice have you made for your country? >> i think i've made a lot of sacrifices. i work very, very hard. i've created thousands and thousands of jobs. tens of thousands of jobs. built great structures. >> those are sacrifices? >> oh, sure, i think they're sacrifices. >> reporter: trump went on to

hadn't spoken a word. >> she had nothing to say, she probably wasn't allowed to have anything to say, you tell me. >> reporter: the khans did not back down one inch. >> i'm very upset when i heard that i didn't say anything. because i was in pain. >> running for president is not an entitlement. to disrespect gold star family. shame on him, shame on his family. >> reporter: on social media, the hash tag #trumpsacrifices started to trend. such as once actually ate a trump steak. had to eat a taco bowl to prove i love hispanics. once had to take a second job in pr just to make ends meet. speaking tonight with abc's columbus affiliate wsyx, trump sought to do some damage control. >> you know, as far as i'm concerned he's a hero. but horrible things were said about me. i think it was frankly very tough. so all i did was respond and i will always respond. >> reporter: for trump's

fruit. more proofs said hillary clinton that trump is temperamentally unfit to be president. >> donald trump is not a normal presidential candidate. >> reporter: republicans didn't go that far. but they too have been forced to distance themselves from their start-bearer. i cannot emphasize enough how deeply i disagree with mr. trump's statement, said 2008 nominee john mccain. i hope americans understand that the remarks do not represent the views its officers or candidates." >> there's two things you can say to a gold star mother. you say "i'm sorry" or "i'm very sorry." >> reporter: for other gold star families, this is personal. karen meredith's son, first lieutenant ken ballard, was 26 when he was killed in iraq. >> it was really the end of the life that i new and that i had planned on having. he was my only child. >> reporter: she received next

>> there is no word for a parent who has lost their child. not in any language. because it's just too painful. it is the worst pain. >> reporter: she brought our cameras to a park near her home. the site of his high school graduation and later where they gathered after his funeral. she takes trump's criticisms of the khans personally. >> i don't know that he has the capability of understanding what it is to lose a child. i haven't cried in a long time admit it, i hate to give him that much power over me, but i cried. because it was so painful. >> reporter: trump does have some defenders on this issue. among them sajid tarar who represents a group called american muslims for trump. he spoke tonight with byron pitts. >> what do you make of when asked about sacrifice, this is george stephanopoulos' question, what sacrifices have you made for your country? donald trump's response, i think

>> there are different definitions of sacrifice. >> how does a reasonable person put in the same sentence sacrifice of a child, to sacrifice by creating jobs? >> you can say yes or you can say no. to the both of them. a comparison. >> was that a reasonable comparison? >> of course, that's his opinion. >> what's your opinion? as someone who supports donald trump? does it give you pause he said that? >> i respect both sacrifices. these are comparable sacrifices is what brought on the wrath of khan. that's just one storyline to come out of george's interview with trump. there was also an entirely different controversy that had to do with the apparent bromance between trump and russian leader vladimir putin. >> what exactly is your relationship with vladimir putin? >> i have no relationship with putin. >> reporter: trump told george one thing -- >> do you have a relationship with vladimir putin?

and i can tell you that he's very interested in what we're doing here today. he's probably very interested in what you and i are saying today and i'm sure he's going to be seeing it in some form. but i do have a relationship with him. >> reporter: putin has had nice things to say about trump. calling him bright and talented last year at his press conference. >> i don't think i've ever met him. i never met him, i don't think i've m >> i think so. >> reporter: and yet -- >> i was in moscow and they treat med so great. putin sent me a present, a beautiful present with a beautiful note. i spoke to all of his people. >> reporter: trump keeps changing his story. >> i was in russia, in moscow recently. and i spoke indirectly and directly with president putin, who could not have been nicer. >> i have no relationship with him -- >> you said for three years, '13, '14, '15, that you did have a relationship with him.

respect -- >> i'm asking you. >> i have no relationship with putin. >> hillary clinton! >> thank you, omaha. >> reporter: tonight in omaha, hillary clinton was celebrated. at a campaign stop that featured billionaire warren buffett. >> that's vice president and president of the united states of america, tim kaine and hillary clinton! >> reporter: also mark cuban in pittsburgh. and michael bloomberg in philadelphia. >> trump says he wants to run the nation like he's running his business? god help us. >> reporter: billionaires united against one of their own in support of a democrat who says she wants to tax the rich. >> i've had a flawless campaign. you'll be writing books about this campaign. >> reporter: there will be books about this campaign. that much is certainly true. i'm david wright for "nightline" in omaha.

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since the time of shakespeare and even well before that, love stories have riveted audiences. over the centuries the basic tale hasn't changed much. the format certainly has. snapchat meets tinder with this new dating app. here's abc's nick watt. >> jordan, i love you so much. >> reporter: yes, you can find love on a tv show.

>> i love you. >> reporter: or in the flesh as we used to. or the new, still evolving, normal online. >> we got a wedding with that video. >> i do like to dance. that's one of my specialties. >> reporter: clair and kevin might never have met -- >> the funny thing is she popped that bottle. it kind of brings out a personality that's fun. >> reporter: might never have met had it not been for the new dating a. >> p lively. a selfie you need a patchwork of videos showing your life, not just you. >> a story is a compilation video and photos all stitched together which we think creates a much more intimate experience and dating profile than selfies can alone. >> reporter: the new kid in the $2 billion industry, will this be the app that cracks the code, makes it big, becomes the uber of online loving? it's inspired by social media apps, not designed for matchmaking but increasingly

hook up. you may remember the tale of two college kids we followed a couple of months ago. >> the guy wearing the striky shirt on the uw south, i'm seriously in love with you, find me. >> reporter: groundbreaking in simplicity, sparking a real-life soap opera at university of wisconsin. >> find that girl, man, she's looking for you. >> this is the first time i've reached out to someone over snapchat. >> reporter: the object of her desire this guy, with unfeasibly ea vikings jersey on the college's snapchat account. >> she had said, guy in the vikings jersey, i'm seriously in love with you. so that was quite a surprise. >> reporter: he suggests 8:30 p.m. date. will they, won't they? all across the campus, nail biting. will mystery girl aka abby and viking man york, will they meet, kiss, fall in love? >> we hope this couple gets

show. >> i thought after that there's no chance of us meeting up, it has passed the time. >> reporter: turns out abby just plain didn't see reid's 8:30 suggestion. >> i put my phone down and wasn't looking at it, i was so embarrassed. so when i looked at it, it was 9:30 at that point. so i kind of fluffed my hair, opened my phone. >> i didn't realize you replied back to my video so i missed the 8:30 at the discovery center. but if it's fate i'll see you >> reporter: remember, snapchat is not designed for this. it's not for dating. >> snapchat is not for dating per se. but it's a great way to date. >> reporter: because, like dating app lively, apparently you're getting more of the person before you ever meet. laurel house is an expert in all things relationships. >> you're actually watching people in realtime to see what their lifestyle looks like. it's not just these very staged, perfectly lit photos of them

this is who they actually are, videos of them doing things that they like to do in their real life. >> reporter: perhaps every singleton should wear a point of view camera and another on a selfie stick 24/7, live stream it so we can see everything before committing to a date. middle-aged man rant over. laurel house now coaches guys like sharif to perform in this increasingly sophisticated and evolving online dating >> you get to hear their voice so you can see how they move, what they look like in their real day to day. >> i'd love to see them in the flesh, just how they are. >> reporter: is he getting the hang of this? >> probably wouldn't be a good idea to send a picture of a girl with me. >> unless it's your sister. >> reporter: are you at heart more of a tinder guy? >> tinder, you go there to -- it's pretty much a have sex site, i would say. >> reporter: okay, back to "sleepless in seattle."

>> this viking dude does not go up and get this girl, he is dumb as hell. >> finally i went to the kk, the college club, which is a bar here. >> she's here, right? are you going to find her? >> i don't know where she is. >> it's going to happen. >> i got really nervous and anxious. kind of panicked a little bit and left. >> don't you do this, mystery girl. don't -- do not do this. if you left -- i'm going to be as devastated as when jojo did not win "the bachelor." waiting for you. >> i'm outside the kk. >> reporter: go back in, go back in! >> come find me. >> and there he was at the bottom of the stairs waiting for me. >> reporter: they say it's like they almost knew each other before they met. because of snapchat videos. kind of the holy grail in online dating. >> it was pretty emotional. because when i saw him, it was like i had already seen him. >> we were friends. it was exciting. >> reporter: meanwhile, back on

a fairy tale as well? >> what is your preferred -- >> old fashioned. >> minute too. >> reporter: she likes his golf video. golf. seriously? >> i can help you on your backswing a little bit. >> i'm working on that a little bit. >> you did a good job. >> that personality, i saw it in the app. it was exactly what it was in the app during the day. it was perfect. >> reporter: is it working too well? every dating app needs repeat customers to survive. right? >> i mean, i'm not going to be on the dating app much longer because this is going so well. >> smooth talker. >> what can i say? >> cheers to that. >> reporter: i'm nick watt for "nightline" in new york. next, dating guru patti stanger takes on her most challenging cases yet. the new show "million-dollar

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and finally tonight, patti

million-dollar matchmaker. a track record that probably could have saved the bachelorette time in spotting love are how do you find the one? here's abc's chief business technology and economics correspondent rebecca jarvis. >> i have a present for you. you're going to be zapped when i decide to zap you. >> reporter: finding love on television can be tricky. >> it's not monologue time. >> reporter: perhaps no one knows that better than patti stanger. >> meet my millionaire! >> reporter: the reality finding matches for millionaires. now the dating guru is taking her talents to we-tv helping some of her most challenging high-profile clients yet. >> no way! >> seven days of patti's boot camp and it's intense. >> reporter: patti gave us a crash course on coupling up. rule number one. take a personal inventory first. >> what are you really looking for? if your wish list is to the

love. >> reporter: second, try a new look. >> do a makeover, buy new clothes, change your hairstyle. >> to the person who says, patti, i hear what you're saying but i want to be me. >> good luck. i'm sorry. it's packaging. we brand everything. why wouldn't we brand ourselves? >> reporter: number three, summer is the season of love, so get going. >> when you're on the east coast and it's freezing, you better date till you mate in the summer. you got three months to work that system by labor day. >> what are your favorit >> go to the beach, see the guys play volleyball, running around with their shirts off. >> reporter: that fairy tale ending could be right around the corner. for "nightline," i'm rebecca jarvis in new york. >> speaking of love. it was mother teresa who said, "love is the fruit in season at all times, and within reach of every hand." thank you for watching abc news. tune into go"good morning ameri" tomorrow. as always we're online at abcnews.com and our "nightline"